#42559C
Closest named color: Denim Blue (#3B5B92). oklch(47% 0.117 270.1), rgb(66, 85, 156).
Aa
White text reads best on this color (6.97:1).
About this color
#42559C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 47%, its chroma 0.117 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.027 away. White text reads best on it, at 6.97:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 3.01:1 |
| White text | 6.97:1 |
Values
| HEX | #42559C |
| RGB | rgb(66, 85, 156) |
| HSL | hsl(227, 41%, 44%) |
| OKLCH | oklch(47% 0.117 270.1) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #42559C | 6.97:1 | AA | Lc -88.9 | Fine for body text |
| Black text on #42559C | 3.01:1 | AA large text | Lc 20.1 | Dividers and decoration only |
| #42559C text on white | 6.97:1 | AA | Lc 84.0 | Fine for body text |
| #42559C text on black | 3.01:1 | AA large text | Lc -18.0 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D1D9EF
oklch(88.6% 0.031 269.8)
-
Step 300
300
#B2C0E6
oklch(81% 0.056 269.2)
-
Step 400
400
#8B9EDA
oklch(70.7% 0.091 270.5)
-
Step 500
500
#6E85D0
oklch(63.1% 0.116 269.9)
-
Step 600
600
#576DBD
oklch(55.5% 0.127 270.3)
-
Step 700
700 (this color)
#42559C
oklch(47% 0.117 270.1)
-
Step 800
800
#3B4B84
oklch(42.8% 0.097 270.1)
-
Step 900
900
#323F6A
oklch(37.8% 0.076 269.8)
-
Step 950
950
#1D253E
oklch(27% 0.048 269.5)
#42559C with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #355D9F | 0.024 |
| Deuteranopia (no green cones) | #29569A | 0.027 |
| Tritanopia (no blue cones) | #076571 | 0.104 |
| Achromatopsia (no color) | #595959 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #42559C
#42559C
oklch(47% 0.117 270.1)
- #705800
#705800
oklch(47.1% 0.096 90.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #42559C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.027
- Twilight #4E518B ΔE 0.031
- Dusky Blue #475F94 ΔE 0.035
- Dusk Blue #26538D ΔE 0.041
- Light Navy Blue #2E5A88 ΔE 0.045
- Dusk #4E5481 ΔE 0.046
- Blueberry #464196 ΔE 0.052
- Denim #3B638C ΔE 0.053
Use #42559C in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.